Frederick chambers



(No Model.) y

P. CHAMBERS. GOLLAPSIBLB CORE BARREL.

No. 478,921. Patented July 12, 1892.

d UNITED STATES PATENT ErrcE.

FREDERICK CHAMBERS, OF DERBY, ENGLAND.

COLLAPSIBLE CORE-BARREL.

SPECIFICATION forming part of Letters Patent No. 478,921, dated July 12, 1892.

Application filed September 14, 1891. Serial No. L105 ,728. (No model.)

To all whom it may concern:

Be it known that I, FREDERICK CHAMBERS, foundry-manager, a subject of the Queen of Great Britain, and a resident of Hallam Fields, Derby, England,have invented a certain new and useful ImprovedCollapsible Core-Barrel for Use in Casting Metal Pipes or Cylinders, of which the following is a specification, reference being had to the accompanying drawlngs.

Figure 1 is a longitudinal sectional view of a core-bar constructed according to my invention, showing a side view of a key-bar I employ; Fig. 2, a longitudinal View of the corebar, partly in section, showing the outer edge of the key-bar. Inboth igures portions of the core-bar are broken away at the center of its length. Fig. 3 shows the top end of the core-bar. Fig. 4. shows a section of the corebar when expanded for use. Fig. 5 shows a section oi' the core-bar when collapsed to enable it to be withdrawn from the pipe or cylinder cast on it. Fig. 6 is a view of the under side of the bottom end of the core-bar. Fig. 7 is an enlarged interior view of one of the hinges I prefer to use to keep the segments of the core-bar in correct relation to each other. Fig. 8 is an enlarged sectional view of one hinge.

The corresponding parts in each figure are indicated by the same letters wherenecessary. The shell of each core-bar consists of two segments aa, one segment b, and the outer edge of a key-bar c. The segments are kept in correct relative position to each other by a number of hinges formed by projecting'pieces don the edges of each segment, which iit into correspondingrecesses d of the next adjacent segment. l prefer hinges so constructed in the place of butt-hinges, as there is less friction and they allow the segment to be taken off and put on readily. Each side of the keybar c is provided with a number of wedges c', tapered longitudinally, which iit corresponding wedge-pieces c2, projecting from the inside of the segments a, keeping the key-bar perfectly rigid when the core-bar is being turned on its journals h h while the core is being `formed upon it with loam or other suitable material, and also when the pressure of molten iron is around the core during the casting of a pipe or cylinder. On the inside of the segment b a numberof distance-pieces e project, which assist in supporting the key-bar c when the core-bar is being expanded. The segments ot a are prevented from being expanded beyond their correct diameter bya number of stay-bolts f. A

On the inner edge of the key-bar c is a number of projecting pieces c3, c4, and c5. The projection c3 is to support the key-bar c on the bolt f when the core-bar is expanded. The projection c5 is to support the key-bar c when the core-bar is collapsed. The inclined portion c4 of the key-bar is to facilitate the longitudinal movements of the key-bar on the stay-bolts f when the core-bar is required to expand and collapse. The key-bar c is held in position when expanded by a cotter g. (Shown at Figs. l, 2, and 3.)

To collapse the core-bar, the cotter g is taken out and the key-bar c moved longitudinally into the position shown in the right-hand portion of Figs. l and 2, where the projection c5 of the key-baro is resting on the stay-bolt f, the outer edge of the key-barcbeing now brought inward from the outer circumference of the core-bar, thus leaving suflicient space to allow `the segments da to collapse, as shown at Fig.

5, the wedge c on the key-bar being now moved away from the wedges c2. To expand the core-bar, the core-bar is xed horizontally,

with the segment b underneath, and the keybar c moved into position shown at the left.- hand portions of Figs. 1 and 2 and at Figs. 3, 4., and 6. 4The projection c3 will then rest on the stay-boltf, and the outer edge of the keybar c will be level with the outer circumference of the core-bar, and the wedges c on the key-bar will be opposite the wedge-pieces c2 on the segments ct a, and the core-bar will be expanded to a true circle and perfectly rigid, the stay-bolts f preventing the segments a a being expanded beyond their correct diameter. The wrought-iron hooks i are cast in the key-bar to keep the key-bar in its receded position after the corebar is collapsed. The hinges or projecting pieces D, formed on the segments a o. and b, are each one-fourth of a circle, so as to .work quite smoothly and without friction when the core-bar is required to collapse.

Shackles of the usual construction (not shown in the drawings) are attached to the IOO topjournal or to the top end of the segments a a of the core-bar to Withdraw it from the pipe or cylinder cast on it. The core-bar is vented to allow the escape of gas in the usual manner by vent-holes. The journals 7L 7L are for the purpose of turning the oore-bar on the stands, as usual in forming cores with loam or other material.

1. The combination, with a core-bar coniposed of hinged segments e a I), said core-bar formed With journals and the segments a a provided at their upper edges with Wedges, of a longitudinal keydoar located in said core-bar and formed at its upper portion with wedges to engage the Wedges of the core-bar and having proj eetions c3 of and incline el formed on its under portion, and stay-barsf, engaging the segments (ta and adapted in connection with said projections and incline to throw said key-har into engagement with the core-bar to expand the latter.

2. The combination, with a coreliar comof a key-bar located and longitudinally inovable in said core-bar, provided at its upper portion with Wedges to engage the wedges of the core-bar and having projections c3 c5 and incline c4 formed on its under portion, staybars f, engaging the segments ad at intervals, stay-pieces e, projecting interiorly from the core-bar, the cotter g, engaging a slot in the key-bar for locking the core-bar in its eX- panded position, and the hook i, formed on the key-har to retain the same in its retracted position after the core-bar is collapsed, substantially as described.

In testimony whereof I have hereunto signed my name in the presence of two subscribing witnesses.

FREDERICK CHAMBERS. lVitnesses:

H. W. GOUGH, A. A. DICKINsoN. 

